【摘要】 多孔涂层材料由于其工艺不同使得涂层材料对脉冲载荷的衰减作用具有不确定性,针对涂层材料的特点,在材料损伤破坏模型的基础上,建立涂层材料等效力学模型。为了验证等效力学模型的正确性,将计算结果同霍普金森压杆试验的结果进行对比,并在此基础上利用试验数据确定等效力学模型计算所需的材料参数,采用有限元方法模拟计算了有涂层和无涂层材料的防护情况下筒状壳体在冲击载荷下的动力学响应。研究结果表明:该种多孔涂层材料等效力学模型能够准确地描述涂层材料在冲击载荷作用下的力学性能,衰减应力波效果明显。更多还原

【Abstract】 The porous coated material has different manufacturing technologies, so the damping function during impact loading is uncertain. An equivalent model is proposed for simulating the coated material during impact loading, and the explicit finite element method is employed to calculate the impacting behavior of the coating. The simulation results are agree well with the experimental data from Hopkinson-bar, which validate the proposed model. In addition, the cylindrical shell structure with and without coating under impulsive loadings are simulated by the proposed model and the explicit finite element method. The results show that the coated material could reduce the stress wave in impacting and satisfy the structure requirement.更多还原